del and sets proposal
Bruno Desthuilliers
bdesth.quelquechose at free.quelquepart.fr
Sat Oct 4 18:36:28 CEST 2008
Larry Bates a écrit :
> You can do the following:
>
> a = [1,2,3,4,5]
> del a[0]
>
> and
>
> a = {1:'1', 2: '2', 3: '3', 4:'4', 5:'5'}
> del a[1]
>
> why doesn't it work the same for sets (particularly since sets are based
> on a dictionary)?
>
> a = set([1,2,3,4,5])
> del a[1]
>
> Yes I know that sets have a remove method (like lists), but since
> dictionaries don't have a remove method, shouldn't sets behave like more
> like dictionaries and less like lists? IMHO del for sets is quite
> intuitive.
For lists, del a[x] means 'remove item at index x'. For dicts, del a[x]
means 'remove key:value pair which key is x'. In both cases, del a[x] is
meaningful because a[x] is meaningful. Sets are neither ordered nor
indexed, and can't be subscripted. So "del aset[x]" is IMHO as
meaningless as 'aset[x]' is. Using this syntax for an operation which
semantic is the same as alist.remove(x) would be at best inconsistent
and confusing.
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